1. Study population
In total 8,295 children (male: 4,032, female: 4,263; age:
3~18 years old) visited two pediatric allergic clinics
for allergy symptoms between 1998 and 2019. Table 1 shows the diagnosis
of the subjects in this study and allergic rhinitis was most common in
the subjects (Allergic rhinitis: 2,295, Atopic dermatitis: 2,259,
asthma: 1,736, and the others: 2,005).